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Abstract

An aluminum-alloy rolled sheet has a chemical composition containing Si: 0.80 mass % or more and 2.5 mass % or less, Mn: 0.40 mass % or more and 1.2 mass % or less, Mg: 0.25 mass % or more and 0.65 mass % or less, and Fe: 0.050 mass % or more and 0.45 mass % or less, the remainder being composed of Al and unavoidable impurities. The uniform elongation of the aluminum-alloy rolled sheet in the direction perpendicular to rolling is 19.5% or greater, and the value of the anisotropy of Lankford values Δr is −0.50 or greater and 0 or less. The aluminum-alloy rolled sheet has properties such that, after introducing a pre-strain of 2%, and thereafter performing aging treatment under conditions of a hold temperature of 170° C. and a hold time of 20 minutes, the 0.2% yield strength is 175 MPa or greater.

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First Claim